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Finding the Third Proportional to 18,816 and 39,180

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Solution

The third proportional to 18,816 and 39,180 is: 81,583.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,816 : 39,180 = 39,180 : x
  2. Step 2: Convert to fraction form
    18,816/39,180 = 39,180/x
  3. Step 3: Cross multiply
    18,816x = 39,180 × 39,180
  4. Step 4: Simplify right side
    18,816x = 1,535,072,400
  5. Step 5: Solve for x
    x = 1,535,072,400/18,816
  6. Step 6: Final answer
    x = 81,583.35

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.